Bought our 2019 Jayco 324BHTS a few weeks ago, aside from getting it loaded up and keeping it plugged it, we haven’t really done much to it or been in it.Today it finally got hot, thermostat was reading 99 inside. I turned on the air, and since we were not going to use it until friday i turned it to AC auto lo.Didn’t really do much. We could hear the ac unit running on the roof but the fan wasn’t blowing any cool air through the ducts.I hit ac hi auto and it runs perfectly normal, as in any camper we've ever had. The thermostat clicks it off at the correct temp and it cools well.Quite frankly i’ve never seen the ac auto low feature so I dont know much about it.Seems to me we’ve had either hi, or auto, where hi runs nonstop.Does it sound to be operating correctly? Ac unit running, but no fan blowing cool air?We do have a 2 unit TT, and am not sure that has anything to do with it.Just looking for clarification. Our past 2 rvs have been 5th wheels, so we are in Downgrade mode.

What A/C and thermostat? Sounds like a problem in the control circuit. The fan should always run with the compressor. On most RV units there is not that much difference in airflow between hi and low speed fan.

thirtydaZe wrote:Our past 2 rvs have been 5th wheels, so we are in Downgrade mode.So, a 5th wheel is superior to a travel trailer? I wonder whey a travel trailer is a down grade from a 5th wheel. Could you please explain.

thirtydaZe wrote:Bought our 2019 Jayco 324BHTS a few weeks ago, aside from getting it loaded up and keeping it plugged it, we haven’t really done much to it or been in it.Today it finally got hot, thermostat was reading 99 inside. I turned on the air, and since we were not going to use it until friday i turned it to AC auto lo.Didn’t really do much. We could hear the ac unit running on the roof but the fan wasn’t blowing any cool air through the ducts.I hit ac hi auto and it runs perfectly normal, as in any camper we've ever had. The thermostat clicks it off at the correct temp and it cools well.Quite frankly i’ve never seen the ac auto low feature so I dont know much about it.Seems to me we’ve had either hi, or auto, where hi runs nonstop.Does it sound to be operating correctly? Ac unit running, but no fan blowing cool air?We do have a 2 unit TT, and am not sure that has anything to do with it.Just looking for clarification. Our past 2 rvs have been 5th wheels, so we are in Downgrade mode.Settings should be A/C on. Fan on/auto/ high /loFan/auto will turn the fan on and off with the compressor. Fan lo or high will keep the fan on all the time. There is not much difference between hi and low. A 90 degrees you need it on high fan till it cools down. There is no difference between your 5hth wheel and a TT. One just has a different hitch then the other. Both have the same A/C

The low speed fan wire may not be connected at the thermostat or at the A/C unit. It’s also possible fan itself isn’t working on low speed (or doesn’t support it).On a Coleman Mach thermostat, the green terminal is high fan and the gray is low. Other brands may be different.What model of thermostat do you have?

If you truly are getting no fan on low... put it on the list of warranty items to get fixed.

A/C Auto Lo? | Good Sam Community

21 Replies

thirtydaZe
Nomad
May 18, 2019
I appreciate all the help. it's just going to go on the warranty list.
Sam_Spade
Explorer
May 17, 2019
Brand new unit.
It has a warranty.
USE IT.
time2roll
Nomad
May 17, 2019
thirtydaZe wrote:
Is this suspected wire in the thermostat itself, or located someplace else?
If you are inclined then open the thermostat and check for a loose or disconnected wire. And check same up in the A/C unit.
newman_fulltime
Explorer II
May 17, 2019
wnjj wrote:
thirtydaZe wrote:
Yes, Low does not work in any mode, just got done messing around with it. The front AC is flawless.

Is this suspected wire in the thermostat itself, or located someplace else?

It connects to the back of the thermostat on one end and the A/C unit on the other.

Some thermostats connect the wires with friction locks and it’s possible they got the insulated part of the wire in there too far. It couldn’t hurt to pull the thermostat and check. Look for a GL or gray labeled pin.

If you don't have a through ceiling ac then you have to go on the roof take the ad apart the control box is in the area where the filter would be
wnjj
Explorer II
May 17, 2019
thirtydaZe wrote:
Yes, Low does not work in any mode, just got done messing around with it. The front AC is flawless.

Is this suspected wire in the thermostat itself, or located someplace else?

It connects to the back of the thermostat on one end and the A/C unit on the other.

Some thermostats connect the wires with friction locks and it’s possible they got the insulated part of the wire in there too far. It couldn’t hurt to pull the thermostat and check. Look for a GL or gray labeled pin.
thirtydaZe
Nomad
May 17, 2019
Yes, Low does not work in any mode, just got done messing around with it. The front AC is flawless.

Is this suspected wire in the thermostat itself, or located someplace else?
newman_fulltime
Explorer II
May 17, 2019
My bet its a Coleman and the low speed fan wire fell off the control box
thirtydaZe
Nomad
May 16, 2019
wnjj wrote:
thirtydaZe wrote:
So what i have is an AirXcel thermostat.

The cool function has hi, low, auto, auto hi, auto low.

The lo function does not do anything besides run the compressor.

From what wveryone has been saying, im assuming its a warranty issue.

So does the fan run by itself in 'Fan lo' mode?

The RV wiring should have 3 wires used for cooling:

1. Cool - runs the compressor
2. Fan low - runs the fan low speed
3. Fan high - runs the fan high speed

In 'Fan low' mode the thermostat turns on #2.
In 'Fan high' mode it turns on #3.
In 'Cool low' mode it turns on #2 always and #1 when cooling is needed.
In 'Cool high' mode it turns on #3 always and #1 when cooling is needed.
In 'Cool low auto' mode it turns on #2 and #1 when cooling is needed.
In 'Cool high auto' mode it turns on #3 and #1 when cooling is needed.

If wire #2 is not connected, there will be no fan in any of the 'low' modes.

great question, thanks for bringing it to my attention. will check it out.
wnjj
Explorer II
May 16, 2019
thirtydaZe wrote:
So what i have is an AirXcel thermostat.

The cool function has hi, low, auto, auto hi, auto low.

The lo function does not do anything besides run the compressor.

From what wveryone has been saying, im assuming its a warranty issue.

So does the fan run by itself in 'Fan lo' mode?

The RV wiring should have 3 wires used for cooling:

1. Cool - runs the compressor
2. Fan low - runs the fan low speed
3. Fan high - runs the fan high speed

In 'Fan low' mode the thermostat turns on #2.
In 'Fan high' mode it turns on #3.
In 'Cool low' mode it turns on #2 always and #1 when cooling is needed.
In 'Cool high' mode it turns on #3 always and #1 when cooling is needed.
In 'Cool low auto' mode it turns on #2 and #1 when cooling is needed.
In 'Cool high auto' mode it turns on #3 and #1 when cooling is needed.

If wire #2 is not connected, there will be no fan in any of the 'low' modes.
thirtydaZe
Nomad
May 16, 2019
So what i have is an AirXcel thermostat.

The cool function has hi, low, auto, auto hi, auto low.

The lo function does not do anything besides run the compressor.

From what wveryone has been saying, im assuming its a warranty issue.

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A/C Auto Lo?

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